Journal
GREEN CHEMISTRY
Volume 18, Issue 23, Pages 6349-6356Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6gc01614f
Keywords
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Funding
- National Research Foundation of Korea through the Global Frontier Project [GF-HIM 2015M3A6B1065264]
- Basic Research Programme [2014-2055412]
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An energy efficient and economically viable bimetallic heterogeneous catalyst system composed of Co and Zn as active centers and 2-methylimidazole as a linker has been synthesized in water at room temperature. The synthesized material (CZ-ZIF) possesses a sodalite topology, similar to the parent materials, ZIF-8 and ZIF-67, with a high surface area of > 1400 m(2) g(-1). The Zn and Co metal ions were shown to occupy equivalent sites throughout the framework in similar proportions, as confirmed by inductively coupled plasma atomic emission spectroscopy and energy dispersive X-ray spectroscopy techniques. CZ-ZIF rendered a high catalytic conversion of epoxides to five-membered cyclic carbonates using CO2 as the C1 source under solvent-and co-catalyst-free conditions with excellent selectivity and manifested better catalytic abilities than ZIF-67 and enhanced framework stability compared to ZIF-8. Furthermore, CZ-ZIF exhibited catalytic activity even at room temperature in the presence of a co-catalyst, and was reusable over a minimum of five cycles with no noticeable decrease in activity. A plausible mechanism for CZ-ZIF catalyzed solvent-and co-catalyst-free epoxide-CO2 cycloaddition has been proposed.
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